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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_20ACADCE2A0614B8BFA91F53DDCAD1DF" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_C5EEEE56B8DA30CFAB801F53DDCAC7AF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsAbstract_1FCE7E0F03859B303BEB1F8C80DC0ADB_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_1FCE7E0F03859B303BEB1F8C80DC0ADB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_1FCE7E0F03859B303BEB1F8C80DC0ADB_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_1FCE7E0F03859B303BEB1F8C80DC0ADB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_67A00A7C0F30FA6404291F8C80DC0CFC" xlink:type="arc" />
    <link:label id="lab_us-gaap_MarketableSecuritiesCurrent_B3248E4D8B9E5B2F3BC41F8C80DC05BB_verboseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_B3248E4D8B9E5B2F3BC41F8C80DC05BB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:label id="lab_us-gaap_MarketableSecuritiesCurrent_B3248E4D8B9E5B2F3BC41F8C80DC05BB_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_B3248E4D8B9E5B2F3BC41F8C80DC05BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable Securities, Current</link:label>
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    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_6B121B68FBEDB754AA6F1F8C80DC8E63_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_6B121B68FBEDB754AA6F1F8C80DC8E63" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net of allowance of $0.9 and $1.2</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_6B121B68FBEDB754AA6F1F8C80DC8E63_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_6B121B68FBEDB754AA6F1F8C80DC8E63" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Net, Current</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsCurrent_440F88BB5AFE94F40A271F8C80DC8C2A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_440F88BB5AFE94F40A271F8C80DC8C2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets (includes $32.0 and $37.0 in restricted cash)</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_440F88BB5AFE94F40A271F8C80DC8C2A_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_440F88BB5AFE94F40A271F8C80DC8C2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
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    <link:label id="lab_us-gaap_GoodFaithAndMarginDepositsWithBrokerDealers_FF6DCB717F45627A99BC1F8C80DCF80A_verboseLabel_en-US" xlink:label="lab_us-gaap_GoodFaithAndMarginDepositsWithBrokerDealers_FF6DCB717F45627A99BC1F8C80DCF80A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash performance bonds and guaranty fund contributions</link:label>
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    <link:label id="lab_us-gaap_AssetsCurrent_5360640530808480ADD01F8C80DC286D_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_5360640530808480ADD01F8C80DC286D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
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    <link:label id="lab_us-gaap_Goodwill_8FA6544561CB584BCE0A1F8C80DC0076_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_8FA6544561CB584BCE0A1F8C80DC0076" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_Goodwill_8FA6544561CB584BCE0A1F8C80DC0076_label_en-US" xlink:label="lab_us-gaap_Goodwill_8FA6544561CB584BCE0A1F8C80DC0076" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1FAA476C7A7DF96D6AF91F8C80EBE78F_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1FAA476C7A7DF96D6AF91F8C80EBE78F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1B2FC754B36EC2F83FF7100300EA27EE" xlink:type="locator" />
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